Well, BPD is basically an attachment disorder, and effects the way you relate with people. There's a lot of insecurity and anxiety and anger. People can from time to time when under stress lose touch with reality or dissociate.
Or, do you mean Bipolar? Bipolar is where you can swing between different extreme mood states - depression, excitement, intense anger. Psychosis may or may not be a symptom.
Psychotic depression is where you're pretty much in a constant state of depression, and have psychosis - hallucinations, hear voices, and/or feel paranoid, as well.
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